Density, biomass and community structure of demersal fishes off the Pacific coast of northeastern Japan

The 2011 Tohoku-oki earthquake caused large eastward displacement and subsidence along the Pacific coast of northeastern Japan. This earthquake partly solved a well-known paradox holding that sense and rate of deformation differ greatly between geologic and geodetic estimates. A paradox remains, however, in explaining long-term uplift along the Pacific coast on a geologic time-scale. Geodetic data show that coastal subsidence continued at a nearly constant rate of ∼5 mm/yr with small fluctuations associated with M7-8 interplate earthquakes for ∼120 years before the Tohoku-oki earthquake. In an area near the Oshika Peninsula where coseismic subsidence is largest, extrapolation of a logarithmic function fitting observed postseismic deformation suggests that coseismic subsidence may be compensated for by the postseismic uplift for several decades but it is difficult to expect the postseismic uplift exceeding 2 meters, so it is implausible that the observed rapid subsidence continued throughout an entire interseismic period in a great megathrust earthquake cycle. We propose a hypothetical model in which the sense of vertical deformation changes from uplift to subsidence during the interseismic period. Using simple elastic dislocation theory, this model is explained by the shallow coupled part of a plate interface in an early interseismic period and the deep coupled part of a late interseismic period.

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Government’s Response to the Great East Japan Earthquake and Tsunami

Journal of Disaster Research ◽

10.20965/jdr.2012.p0517 ◽

2012 ◽

Vol 7 (sp) ◽

pp. 517-527 ◽

Cited By ~ 2

Author(s):

Atsushi Koresawa ◽

Keyword(s):

Pacific Coast ◽

Recovery Process ◽

Japanese Government ◽

Great East Japan Earthquake ◽

Northeastern Japan ◽

The Pacific ◽

Hyogo Framework For Action ◽

One Year

This paper analyzes how the Japanese government has responded to the March 11, 2011, Great East Japan Earthquake and subsequent tsunamis that devastated cities and towns along the Pacific coast of northeastern Japan claiming many precious lives and causing extremely extensive destruction. The resilience of a society depends largely on how it identifies existing gaps, how it addresses them in the recovery process, and how it integrates solutions in the existing disastermanagement system as a result. From such a perspective, this paper examines the government’s response to the disaster for approximately the first one year following it by taking stock of progress made versus the priorities of the Hyogo Framework for Action 2005-2015.

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Occurrence of Pacific bluefin tuna Thunnus orientalis larvae off the Pacific coast of Tohoku area, northeastern Japan: Possibility of the discovery of the third spawning ground

Fisheries Oceanography ◽

10.1111/fog.12445 ◽

2019 ◽

Vol 29 (1) ◽

pp. 46-51 ◽

Cited By ~ 8

Author(s):

Yosuke Tanaka ◽

Atsushi Tawa ◽

Taiki Ishihara ◽

Etsuro Sawai ◽

Misato Nakae ◽

...

Keyword(s):

Pacific Coast ◽

Bluefin Tuna ◽

Pacific Bluefin Tuna ◽

Spawning Ground ◽

Thunnus Orientalis ◽

The Third ◽

Northeastern Japan ◽

The Pacific

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Chaetognath assemblages along the Pacific Coast and adjacent inland waters of the Philippines: relative importance of oceanographic and biological factors

ICES Journal of Marine Science ◽

10.1093/icesjms/fsr209 ◽

2012 ◽

Vol 69 (3) ◽

pp. 410-420 ◽

Cited By ~ 5

Author(s):

Mary Mar P. Noblezada ◽

Wilfredo L. Campos

Keyword(s):

Community Structure ◽

Pacific Coast ◽

Mass Movement ◽

The Philippines ◽

Inland Waters ◽

Relative Importance ◽

Biological Factors ◽

Comprehensive Information ◽

The Pacific ◽

Plankton Distribution

Abstract Noblezada, M. M. P., and Campos, W. L. 2012. Chaetognath assemblages along the Pacific Coast and adjacent inland waters of the Philippines: relative importance of oceanographic and biological factors. – ICES Journal of Marine Science, 69: 410–420. When studying plankton distribution, it is necessary to investigate the biology of the target organisms and the surrounding physical environment. Station and species groupings are only useful if they provide insight into the environmental associations of the species in the group. The study covers two geographic regions: the Pacific Coast (Bicol Shelf) and inland waters (San Bernardino Strait, Ticao Pass, Sibuyan, and Visayan Seas) of the Philippines. Comprehensive information is provided on chaetognath assemblages and distribution within the regions. The findings are integrated with oceanographic conditions and phenomena that define the characteristics of the subareas and consideration given to how these conditions affect chaetognath ecology. A comparison is also provided of the community structure of the two regions, and the possible use of chaetognaths as indicator species of water mass movement and oceanographic phenomena explored. In all, 28 284 specimens were examined, and 33 species from 17 genera were identified. Chaetognath distributions, abundance, and community structure were analysed using dissimilarity indices and multiple regression. The results show that the distribution of chaetognaths agrees well with the movement of oceanic water from the Pacific into the central part of the archipelago.

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